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Bruxism and sleep apnea are known to have multiple possible causes, but one factor that many dentists are noticing as a recurrent risk for both of these disorders is narrow arch width, especially in the upper jaw.
In subjects with an impacted maxillary canine, the interpremolar width was used to determine the anterior arch width instead of the inter-canine width as first premolar eruption precedes that of the permanent canine, its position in the arch is less affected by crowding [Al-Nimri and Gharaibeh, 2005].
With canine eruption, arch width typically reaches a maximum in the preteen years, followed by a slow, persistent reduction over at least the next decade.